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Date: Thu, 19 Jan 2012 22:26:40 +0000 (UTC)
From: "Lars Hofhansl (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HBASE-5229) Support atomic region operations
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    [ https://issues.apache.org/jira/browse/HBASE-5229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13189434#comment-13189434 ] 

Lars Hofhansl commented on HBASE-5229:
--------------------------------------

That is true when it comes to storage.
However our (current) API is mostly row based. There is no way to start or stop a stop a scan at a column, there are many assumptions about rows baked into the scanner, etc. I don't think ColumnRangeFilter would be good enough here.

Declaring a prefix and honoring it during splitting seems simpler and more in line with our current API and (probably?) what a user would expect.

It is another avenue, though. For example we can add Scan.set{Start|Stop}Key (where we can present prefixes of the full key, rather than just the row key), and handle it accordingly at the server. Would also need a nextKeyValue (or nextColumn or something) method on ResultScanner along with the server code that does this efficiently.

                
> Support atomic region operations
> --------------------------------
>
>                 Key: HBASE-5229
>                 URL: https://issues.apache.org/jira/browse/HBASE-5229
>             Project: HBase
>          Issue Type: New Feature
>          Components: client, regionserver
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>             Fix For: 0.94.0
>
>         Attachments: 5229.txt
>
>
> As discussed (at length) on the dev mailing list with the HBASE-3584 and HBASE-5203 committed, supporting atomic cross row transactions within a region becomes simple.
> I am aware of the hesitation about the usefulness of this feature, but we have to start somewhere.
> Let's use this jira for discussion, I'll attach a patch (with tests) momentarily to make this concrete.

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